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New Customers (or switching modems) make sure Comcast has the HFC-MAC (CM-MAC) as your modem MAC.. If they get the CPE-MAC (WAN-MAC) the modem will not work correct and your CPE will only get a IPv6 address..
I am finding this is most of the issues I have found..
I detached a 3rd party extender from the xfinity router and moved upstairs.
after this 2 computers, an ipad and a peloton bike no longer can connect to the internet properly. One computer is fine. The strange thing is the computers that are not working correct have perfect connections to GOOGLE< Netflicks, facebook but almost nothing else. So there can connect to the wifi signal but are limited to the larger sites. On the internet these are the ipn6 encription website.